<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addRoleDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe :row-key="rolelist.id">

        <!-- 展开列 -->
        <el-table-column type="expand" label="😊">
          <template slot-scope="scope">
            <!-- 渲染一级权限 5+19总共24列 -->
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children"
              :key="item1.id">
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <el-col :span="19">
                <!-- 渲染二级权限 6+18总共24列 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children"
                  :key="item2.id">

                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <!-- 渲染三级权限 -->
                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable
                      @close="removeRightById(scope.row, item3.id)">{{ item3.authName }}</el-tag>
                    <!-- 这里的scope.row依然是整个数据 -->
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>

        <!-- 索引列 -->
        <el-table-column type="index" label="序号"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <!-- 修改按钮 -->
            <el-button icon="el-icon-edit" size="mini" type="primary" @click="showEditDialog(scope.row.id)">编辑
            </el-button>
            <!-- 删除按钮-->
            <el-button icon="el-icon-delete" size="mini" type="danger" @click="removeRoleById(scope.row.id)">删除
            </el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>

      </el-table>

    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all
        :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑角色的对话框 -->
    <el-dialog :visible.sync="editRoleDialogVisible" title="编辑角色" width="35%" @close="editDialogClosed">
      <!-- 内容主体区域 -->
      <el-form ref="editFormRef" :model="editForm" :rules="addFormRules" label-width="70px">
        <!-- prop=username 对应了 addFormRules中的username校验规则-->
        <el-form-item label="角色名称" label-width="85px" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" label-width="85px" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRole">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 添加角色的对话框 -->
    <el-dialog :visible.sync="addRoleDialogVisible" title="添加角色" width="35%" @close="addDialogClosed">
      <!-- 内容主体区域 -->
      <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="70px">
        <!-- prop=username 对应了 addFormRules中的username校验规则-->
        <el-form-item label="角色名称" label-width="85px" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" label-width="85px" prop="roleDesc">
          <el-input v-model="addForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'VueRoles',
  data () {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName', /* 要展示哪个文本 */
        children: 'children' /* 子节点要取哪个东西 */
      },
      // 默认选中的节点Id值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: '',
      addRoleDialogVisible: false,
      // tianjia
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      addFormRules: {
        roleName: [
          {
            required: true,
            message: '请输入角色名称',
            trigger: 'blur'
          },
          {
            min: 2,
            max: 6,
            message: '角色名称长度在 2 到 6 个字符',
            trigger: 'blur'
          }
        ],
        roleDesc: [
          {
            required: true,
            message: '请输入角色描述',
            trigger: 'blur'
          }
        ]
      },
      editForm: {},
      editRoleDialogVisible: false
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolelist = res.data
    },
    // 根据Id删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }

      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }

      role.children = res.data /* 返回的数据就是角色所拥有的新权限 */
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      // 保存对应的id 供后面的allotRights方法使用
      this.roleId = role.id
      // 展示前先获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }

      // 把获取到的权限数据保存到 data 中
      this.rightslist = res.data
      // 递归获取三级节点的Id并保存到defKeys数组中  这样一打开分配对话框就会把数组里的id给勾选上 关闭还要把数组清空 要不然下次打开会累加
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到arr数组中 使得一打开分配列表就会将他们勾选上
    getLeafKeys (node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      // 不是三级节点 递归调用
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 关闭分配权限的对话框
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击确定后为角色分配权限
    async allotRights () {
      // 把所有全选和半选的id保存到数组中
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(), /* getCheckedKeys是tree组件自带的方法 ...是展开到数组中 */
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',') /* 改为以逗号拼接的字符串 */

      const { data: res } = await this.$http.post(/* 请求都要接收 以便做请求失败与成功的提示 */
        `roles/${this.roleId}/rights`,
        { rids: idStr } /* 传递rids参数 */
      )

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.getRolesList() /* 刷新 */
      this.setRightDialogVisible = false /* 隐藏 */
      this.$message.success('分配权限成功！')
    },
    /**
    * 添加角色
    */
    async addRole () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        // 可以发起添加角色的网络请求
        const { data: res } = await this.$http.post('roles', this.addForm)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败!')
        } else {
          this.$message.success('添加角色成功!')
          this.getRolesList()
          this.addRoleDialogVisible = false
        }
      })
    },
    /**
     * 监听 添加角色对话框的关闭事件
     */
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    /**
     * 编辑角色
     */
    async editRole () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.put(`roles/${this.editForm.roleId}`,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc
          }
        )
        if (res.meta.status !== 200) {
          this.$message.error('更新角色信息失败!')
        } else {
          this.editRoleDialogVisible = false
          this.getRolesList()
          this.$message.success('更新角色成功!')
        }
      })
    },
    /**
     * 展示编辑角色的对话框
     * @param roleId
     */
    async showEditDialog (roleId) {
      const { data: res } = await this.$http.get(`roles/${roleId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色信息失败')
      } else {
        this.editForm = res.data
        this.editRoleDialogVisible = true
      }
    },
    /**
     * 根据角色id删除角色
     * @param roleId
     */
    async removeRoleById (roleId) {
      // 弹框询问用户是否直接删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })

      if (confirmResult === 'confirm') {
        console.log('确认了删除')
        const { data: res } = await this.$http.delete(`roles/${roleId}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除角色失败!')
        } else {
          this.getRolesList()
          return this.$message.success('删除角色成功!')
        }
      }
    },
    /**
     * 监听 修改角色对话框的关闭事件
     */
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
